package com.lagou.config;

import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import javax.xml.transform.sax.SAXResult;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class XMLMapperBuilder {
    private Configuration configuration;

    public XMLMapperBuilder(Configuration configuration) {
        this.configuration = configuration;
    }

    public void parse(InputStream inputStream) throws DocumentException {
        Document document =new SAXReader().read(inputStream);
        Element rootElement =document.getRootElement();
        String namespace = rootElement.attributeValue("namespace");

        List<Element> elements =new ArrayList<>();
        elements.addAll(rootElement.selectNodes("//select"));//select 标签
        elements.addAll(rootElement.selectNodes("//insert"));//insert 标签
        elements.addAll(rootElement.selectNodes("//update"));//update 标签
        elements.addAll(rootElement.selectNodes("//delete"));//delete 标签
        //List<Element> list =rootElement.selectNodes("//select");
        for (Element element:elements){
            String id =element.attributeValue("id");
            String resultType =element.attributeValue("resultType");
            String paramterType =element.attributeValue("paramterType");
            String sqlText = element.getTextTrim();
            MappedStatement mappedStatement =new MappedStatement();
            mappedStatement.setId(id);
            mappedStatement.setResultType(resultType);
            mappedStatement.setParamterType(paramterType);
            mappedStatement.setSql(sqlText);
            String key =namespace+"."+id;
            configuration.getMappedStatementMap().put(key,mappedStatement);
        }
    }
}
